Mark 9:39

But Jesus said, "Forbid him not; for there is no one who shall exercise power in My name, and be able quickly to speak evil of Me;

Matthew 7:22-23

Many will say to Me in that day, 'Lord, Lord, did we not prophesy by Thy name? and by Thy name cast out demons, and by Thy name do many mighty works,'"

Matthew 13:28-29

And he said to them, 'An enemy did this.' The servants say to him, 'Do you wish, then, that we, going, should gather them up?'

Mark 10:13-14

And they were bringing little children to Him, that He might touch them; and the disciples rebuked them.

Acts 19:13-16

But some also of the wandering Jews, exorcists, attempted to name over those having evil spirits the name of the Lord Jesus, saying, "I adjure you by the Jesus Whom Paul preaches."

1 Corinthians 9:27

But I buffet my body, and bring it into bondage; lest, by any means, after having preached to others, I myself should be rejected.

1 Corinthians 12:3

Wherefore, I make known to you that no one speaking in the Spirit of God, says, "Jesus is accursed"; and no one can say, "Jesus is Lord," except in the Holy Spirit.

1 Corinthians 13:1-2

If I speak with tongues of men and of angels, but have not love, I have become sounding brass, or a clanging cymbal.

Philippians 1:18

What then? save that in every way, whether in pretense or in truth, Christ is being proclaimed; and in this I rejoice, yea, and will rejoice.

Treasury of Scripture Knowledge

Summary

But Jesus said, Forbid him not: for there is no man which shall do a miracle in my name, that can lightly speak evil of me.

General references

Bible References

Forbid

Mark 10:13
And they were bringing little children to Him, that He might touch them; and the disciples rebuked them.
Matthew 13:28
And he said to them, 'An enemy did this.' The servants say to him, 'Do you wish, then, that we, going, should gather them up?'
Philippians 1:18
What then? save that in every way, whether in pretense or in truth, Christ is being proclaimed; and in this I rejoice, yea, and will rejoice.

There

Matthew 7:22
Many will say to Me in that day, 'Lord, Lord, did we not prophesy by Thy name? and by Thy name cast out demons, and by Thy name do many mighty works,'"
Acts 19:13
But some also of the wandering Jews, exorcists, attempted to name over those having evil spirits the name of the Lord Jesus, saying, "I adjure you by the Jesus Whom Paul preaches."
1 Corinthians 9:27
But I buffet my body, and bring it into bondage; lest, by any means, after having preached to others, I myself should be rejected.
1 Corinthians 13:1
If I speak with tongues of men and of angels, but have not love, I have become sounding brass, or a clanging cymbal.

Lightly

1 Corinthians 12:3
Wherefore, I make known to you that no one speaking in the Spirit of God, says, "Jesus is accursed"; and no one can say, "Jesus is Lord," except in the Holy Spirit.

General references

2 Corinthians 13:8
For we can do nothing against the truth, but for the truth.